Glass and batch therefor



Patented May 5, 1925,

UNITED STATES PATENT OFFICE.

JOSEPH CARL PABKINSON, OF TABENTUM, PENNSYLVANIA, ASSIGNOR T PITTS- BURGH PLATE GLASS COMPANY A CORPORATION OF PENNSYLVANIA.

GLASS AND BATCH THEREFOR.

No Drawing.

1 '0 all whom it may concern:

Be it known that I, J OSEPH CARL PARKIN- SON, a citizen of-the United States, and a resident of Tarentum, in the county of Y5 Allegheny and State of Pennsylvania, have made a new anduseful invention in Improvements in Glass and'Batches Therefor, of which the following is a specification.

The invention relates to absorptive glass, and has for its principal object the provision of an improved glass particularly adapted for use in spectacles which completely cuts off the passage of the'ultra violet rays and a portion of the violet rays and which is at the same time highly transparent and has a pleasing yellow tint. The

batch preferably used in producing the glass is as follows:

The glass can be produced without the sulphur being present, but better results are obtained'when sulphur is present. to supply any sulphur which may be lost by the decomposition of the cadmium sulfide. This sulphur ma metallic sul de, such as zinc sulfide. The yellow tint will vary in accordance with the also be added as another.

Application filedNovember 15, 1922. Serial No. 601,145.

amount of the coloring sulfide present, the

amount in the batch given above figuring about three quarters of one weight of the total batch.

What I claim is: 1. A glass for absorbing ultra-violet rays containing cadmium, such glass having a yellow tint, and being substantially free per cent of the from coloring matter other than the cadto absorb ultra-violet rays and including cadmium sulfide, and being substantially free from any other coloring ingredient.

4. A batch for producing a glass adapted to absorb ultra-violet rays and including cadmium sulfide and sulphur, and being substantially free from any other coloring ingredient. g

5. A batch for producing a glass adapted to absorb ultra-v1olet rays and including approximately three quarters of one per cent by weight of cadmiumsulfide, and he ing su tantially ing ingredient.

In testimony whereof, subscribed my October, 1922. 7

J. CARL PARKINSON.

free from any other color- I have hereunto name this 31st. day of 

